That' s strange. Normally, it should work after unpacking.
Unfortunately, I can only give you typical advices like starting it as admin, see if your antivirus program blocks it in any way or just try to download it again. I'm sorry, I hope it will work somehow!
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Thanks for the quick answer, I figured it out. In case someone has the same problem:
I've found through the task manager that there were 2 programs running with the name "nwjs" that didn't open a window. Once I manually ended those 2 programs I could start the game. So I think the error came from the software in which the game was made and not your game itself.